、。
There will be a lunar eclipse tomorrow.
Literal
Tomorrow, lunar-eclipse [subject-が] occur [polite-ます].
月食 ('moon-eat' = lunar eclipse) is a calque metaphor shared across Chinese and Japanese — the moon being 'eaten.' 起こる ('to occur, to happen') is intransitive, used for events happening spontaneously. This is a naturally neutral sentence for news or astronomy contexts.